JP6548169B2 - Hybrid type stepping motor - Google Patents

Description

  The present invention relates to a hybrid stepping motor.

  Hybrid type stepping motors are widely used, for example, in OA devices such as printers, copiers and multifunction machines, FA devices, industrial devices such as robots, medical devices, and the like.

  In this hybrid stepping motor, the output electrodes are concentrated on the electrode fixing portion of the output electrode fixing frame, and the lead tap wire guide groove portion of the stator winding is formed so as to extend toward the corresponding output electrode. As a result, positioning of lead taps of the stator winding on the output electrode of the stator winding can be easily performed. As a result, automation of soldering work of the lead taps of the stator winding to the output electrode is also possible. There has been proposed a hybrid stepping motor provided with lead tap wire connection portions of stator windings that can be easily performed (see, for example, Patent Document 1).

  In the hybrid stepping motor described in Patent Document 1, after the output electrodes 26 are concentrated on the electrode fixing portion 25 of the output electrode fixing frame 23, the lead tap wire guide groove 27 of the stator winding corresponds. Since it is formed to extend toward the output electrode 26, it is possible to easily position the lead tap wire of the stator winding on the output electrode 26.

  However, as described in FIG. 6 (A) of Patent Document 1, the core wire 31 a of the lead wire 31 is fixed on the output electrode 26 by soldering. For this reason, when fixing the lead tap wire of the stator winding on the output electrode 26 with solder, the bonding of the core wire 31 a of the lead wire 31 may be loosened by heating, resulting in a conduction failure.

  Further, in FIG. 10 of Patent Document 1, the output electrode 26 'has a terminal structure, and a connector 43 having a female electrode to which a lead wire is fixed is used to electrically connect the lead wire and the output electrode 26'. It is stated that a connection may be made. However, this structure has a problem that it can not cope with the connector of connector pin joint. In addition, the code | symbol attached | subjected to each matter described above is what was described in patent document 1. FIG.

Japanese Utility Model Publication No. 5-2598

  In view of the above problems, the present invention is a hybrid stepping motor in which a connector housing is integrally formed with an insulator, and the lead wire of the stator winding can be easily positioned on the output terminal. An object of the present invention is to provide a hybrid stepping motor capable of automating a soldering operation of lead wires to output electrodes.

  In order to achieve the above object, (1) a first aspect according to the present invention is a hybrid stepping motor, comprising a stator core, and upper and lower insulators mounted from both axial sides of the stator core An insulator, a connector housing having a terminal pin and a wiring pattern and protruding outward in the radial direction on the lower insulator, and a first magnetic pole provided on the side of the lower insulator and located in the vicinity of the terminal pin A plurality of magnetic poles including a plurality of magnetic poles, and a plurality of locking pins for locking a stator winding wound around the plurality of magnetic poles; It is characterized by having.

(2) In the above (1), when the stator core is inverted and viewed, the wiring pattern is positioned below the lowermost surface of the lower insulator on which the crossover wire and the lead-out wire extend. May be

(3) In the above (1) or (2), the locking pin has a cross-sectional shape formed into a pentagon of home base shape, and the apex of the salient angle is disposed facing outward, and each corner is It may be an R surface.

  According to the present invention, there is provided a hybrid stepping motor in which a connector housing is integrally formed with an insulator, and the lead wire of the stator winding can be easily positioned on the output terminal. It is possible to provide a hybrid stepping motor capable of automating the soldering operation of the wire to the output electrode.

1 is a perspective view of a hybrid stepping motor according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the hybrid stepping motor shown in FIG. It is a disassembled perspective view of the part of the lower side insulator shown in FIG. It is a perspective view of the stator of the hybrid type stepping motor shown in FIG. FIG. 5 is a cross-sectional view of a stator of the hybrid stepping motor shown in FIG. 4; FIG. 6 is a partially enlarged view of the stator shown in FIG. 5 when it is turned upside down. FIG. 5 is a bottom view of the stator shown in FIG. 4; It is explanatory drawing of the winding pattern of the 1st phase of the hybrid type | mold stepping motor of this invention. It is explanatory drawing of the winding pattern of the 2nd phase of the hybrid type | mold stepping motor of this invention. It is a figure explaining the modification 1 about the locking pin of the insulator in the hybrid type | mold stepping motor of this invention. It is a figure explaining the modification 2 about the PCB board | substrate in the hybrid type | mold stepping motor of this invention.

  Hereinafter, modes for carrying out the present invention (hereinafter, referred to as “embodiments”) will be described in detail based on the attached drawings.

(Configuration of the embodiment)
FIG. 1 is a perspective view of a hybrid stepping motor 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the hybrid stepping motor 1 shown in FIG.

  As shown in FIGS. 1 and 2, the hybrid stepping motor 1 of the present embodiment is a two-phase hybrid stepping motor, and a connector housing 20 is integrally formed on the upper insulator 18 and the lower insulator 19. In the above configuration, the output terminals are concentratedly arranged on the outside of the stator core 12. The hybrid stepping motor 1 comprises a stator 2, a rotor 3 rotatably disposed inside the stator 2, a front flange 4 disposed at both axial ends of the stator 2, and a rear flange 5. It is done. Bearings 6, 7 are attached to the front flange 4 and the rear flange 5, respectively, to rotatably support the rotor 3.

  The rotor 3 is a disc-like member disposed between two rotor cores 8 and 9 and two rotor cores 8 and 9 configured by laminating a predetermined number of cores of soft magnetic material (for example, silicon steel plate etc.). A rotor magnet 10 and a shaft 11 made of a nonmagnetic material are formed, and a plurality of small teeth are formed at equal pitches on the outer peripheral surface of the rotor cores 8 and 9. The rotor magnet 10 is two-pole magnetized in the axial direction.

  The stator 2 includes a stator core 12 configured by laminating a predetermined number of soft magnetic material (for example, silicon steel plates) cores, an insulator 13 made of an insulating material mounted on the stator core 12, and the stator core 12 via the insulator 13. , And a stator winding 14 wound around. As will be described later, in the stator core 12, eight magnetic poles 15 (first magnetic pole 151 to eighth magnetic pole 158, see FIG. 7) projecting radially inward from the annular yoke portion are equally spaced at a 45.degree. The tip of the magnetic pole 15 is provided with circumferentially extending pole teeth 16 (see FIG. 10), and a plurality of small teeth 17 (see FIG. 10) are arranged at equal pitch on the surface of the pole teeth 16 facing the rotor cores 8 and 9. It is formed.

  The insulator 13 is composed of an upper insulator 18 and a lower insulator 19, and is mounted from both sides in the axial direction of the stator core 12. A connector housing 20 projecting radially outward is integrally molded with the lower insulator 19.

  FIG. 3 is an exploded perspective view of the lower insulator 19 shown in FIG. As shown in FIG. 3, the PCB substrate 21 having the wiring pattern 22 is mounted on one side of the connector housing 20 of the lower insulator 19, and the connector pins 24 are insert-molded on the inside of the other side of the connector housing 20. Attach the inner connector 23. Then, the connector pins 24 are inserted into the through holes 25 of the connector housing 20 and the through holes 26 of the PCB substrate 21 and are electrically connected to the wiring pattern 22 by solder.

  The inner connector 23 is, for example, a commercially available 4-pin connector. However, the inner connector 23 may of course have a configuration in which the connector pin 24 is insert-molded at a location of the connector housing 20.

  After the insulator 13 is attached to the stator core 12 configured by laminating a predetermined number of cores, a predetermined number of turns from above the insulator 13 via the locking pin 31 in a portion to be wound will be described later. And the stator winding 14 (see FIGS. 8 and 9) is wound.

  FIG. 4 is a perspective view of the stator 2 shown in FIG. FIG. 5 is a cross-sectional view of the stator 2 shown in FIG. FIG. 6 is a partially enlarged view of the stator 2 of FIG. 5 when it is seen inverted. In FIG. 6, for the sake of convenience, the lower insulator 19 is disposed on the upper side of the figure in order to explain the state in which the lead wire 14a of the stator winding 14 is drawn to the PCB substrate 21. As shown in FIG. 6, the positional relationship between the lowermost surface B on which the crossovers (and lead wires) in the lower insulator 19 are covered and the surface (uppermost surface) A of the wiring pattern 22 formed on the PCB substrate 21 are the same. is not. When the stator 2 is set in the winding machine with the lower insulator 19 upward, as shown in FIG. 6, the surface (uppermost surface) A of the wiring pattern 22 is covered by the crossover (and lead-out) wire in the lower insulator 19. It is located below the lowermost surface B. For this reason, when drawing out the lead wire 14a of the stator winding 14 to the PCB substrate 21, workability is facilitated without restriction on the movement of the nozzle of the winding machine.

  FIG. 7 is a bottom view of stator 2 shown in FIG. The wiring pattern 22 to be an output terminal is a land portion 27 for joining the lead wire 14a, which is a winding end of the stator winding 14 (see FIGS. 8 and 9), to one end side (outside side). The through hole 26 (terminal pin) for inserting the connector pin 24 is formed on the other side (stator side). As shown in FIG. 7, in the wiring pattern 22, the center C1 of the land portion 27 and the center C2 of the through hole 26 do not coincide with each other and are shifted. The wiring patterns 22 are arranged in line symmetry with the center C0 of the PCB substrate 21 as the axis of symmetry. Here, four patterns are formed on the PCB substrate 21 as shown in FIG.

  In this embodiment, a 4-pin connector is used as the connector pin 24 as shown in FIG. 3 to form four patterns. However, the present invention is not limited to this configuration, and the number of pins needed will be adjusted. It is formed.

  Further, in the present embodiment, the connector pin 24 is a straight bar as shown in FIG. 3, but when the insertion direction of the external connector is radial, the L-shaped pin may be formed by insert molding.

  Next, the arrangement of the magnetic pole 15 and the lock pin 31 for connecting wire lock of the stator winding 14 will be described. In the present embodiment, as shown in FIG. 7, six locking pins 31 are arranged for eight magnetic poles 15. That is, the magnetic poles 15 are used as the first magnetic poles 151 with the magnetic poles 15 in the vicinity of the through holes 26 (terminal pins) provided in the connector housing 20 clockwise at the 45 ° pitch as described above. The third magnetic pole 153, the fourth magnetic pole 154, the fifth magnetic pole 155, the sixth magnetic pole 156, the seventh magnetic pole 157, and the eighth magnetic pole 158 are equally disposed.

  On the other hand, the locking pin 31 is provided in a part of the area between the eight magnetic poles 15, and an installation area and a non-installation area are formed. That is, in the regions on both sides of the third magnetic pole 153, the regions on both sides of the fifth magnetic pole 155, and the regions on both sides of the seventh magnetic pole 157, the first locking pin 311 and the second locking pin 312 The third locking pin 313 and the fourth locking pin 314, and the fifth locking pin 315 and the sixth locking pin 316 are disposed, respectively. In the regions on both sides of the first magnetic pole 151, the locking pins 31 are not provided at the positions of the first virtual locking pins 311v and the second virtual locking pins 312v indicated by broken lines as non-placement regions.

  Although the first magnetic pole 151 is provided in the vicinity of the through hole 26 (terminal pin) provided in the connector housing 20, the locking pin 31 is provided in the area on both sides of the first magnetic pole 151 at this position. By not providing it, the degree of freedom of the nozzle operation when pulling out the end of the stator winding 14 is increased, and the workability is improved. Although six locking pins 31 are provided for eight magnetic poles 15 in this embodiment, the number of locking pins 31 is not limited, and the magnetic poles 15 provided in the vicinity of the through holes 26 (terminal pins) are not limited. It is good if locking pins 31 are not provided on both sides of the frame.

  In the arrangement of the magnetic pole 15 and the locking pin 31, the stator winding 14 is wound with one phase after being wound, as described later. In each phase, each winding portion is wound from the lower side to the upper side, and finally, the lead wire 14a is drawn from the lower side, and it is positioned straight and drawn out on the land portion 27 through the guide groove 30. . Then, the lead wire 14a is electrically connected to the land portion 27 by an automatic soldering machine (not shown). After the connection, the extra portion of the lead 14a is cut.

  Since the guide groove 30 has a V-shaped cross section in which the groove width gradually decreases, the lead wire 14 a of the stator winding 14 is smoothly guided into the guide groove 30.

  Next, a winding pattern of the stator winding 14 will be described with reference to FIGS. 8 and 9.

  The winding pattern of the first phase is shown in FIG. As shown in FIG. 8, eight magnetic poles 15 are equally distributed on the stator core 12 at a 45 ° pitch in the circumferential direction, and the first phase stator winding 14 has a first magnetic pole 151, a first magnetic pole 151 in the clockwise direction. The three magnetic poles 153, the fifth magnetic pole 155, and the seventh magnetic pole 157 are wound with a predetermined number of turns. In the figure, S1 indicates the winding start of the first phase, and E1 indicates the winding end of the first phase. In addition, a circle × mark indicates a state of going from the front side to the back side, and a circle · mark indicates a state of going to the front side from the back side.

  First, the winding start S1 of the stator winding 14 (magnet wire) is wound on the first magnetic pole 151 from the front side to the back side through the guide groove 30 from above the land portion 27 and then back It is drawn from the side toward the front side and passes through the wall behind the second magnetic pole 152. Second, after the stator winding 14 is wound along the first locking pin 311 and wound around the third magnetic pole 153 from the near side to the far side, the far side from the far side is the near side. It is pulled out to the side and passes through the wall behind the fourth magnetic pole 154 along the second locking pin 312 and the third locking pin 313.

  Thirdly, the stator winding 14 is wound around the connecting wire along the third locking pin 313 and wound around the fifth magnetic pole 155 from the near side to the far side, and then from the far side to the near side. It is pulled out to the side and passes the wall behind the sixth magnetic pole 156 along the fourth locking pin 314 and the fifth locking pin 315. Fourth, after the stator winding 14 is wound along the fifth locking pin 315 and wound on the seventh magnetic pole 157 from the near side to the far side, the far side is the near side. It is pulled out to the side and passes the wall behind the eighth pole 158 along the sixth locking pin 316. Fifth, after the stator winding 14 is pulled out from the back side to the front side through the lower side of the first magnetic pole 151, the lead wire 14a is positioned on the land 27 through the guide groove 30. It is done (E1).

  The winding pattern of the second phase is shown in FIG. As shown in FIG. 9, the second-phase stator winding 14 is wound around the eighth magnetic pole 158, the sixth magnetic pole 156, the fourth magnetic pole 154, and the second magnetic pole 152 with a predetermined number of turns counterclockwise. Ru. In the figure, S2 indicates the winding start of the second phase, and E2 indicates the winding end of the second phase.

  First, the winding start S2 of the stator winding 14 (magnet wire) is wound from the land portion 27 through the guide groove 30 to the eighth magnetic pole 158 from the near side to the far side, It is pulled out from the side toward the near side and passes through the wall behind the seventh magnetic pole 157 along the sixth locking pin 316 and the fifth locking pin 315. Second, after the stator winding 14 is wound along the fifth locking pin 315 and wound around the sixth magnetic pole 156 from the near side to the far side, the far side is the near side. It is pulled out to the side and passes the wall behind the fifth magnetic pole 155 along the fourth locking pin 314 and the third locking pin 313.

  Thirdly, after the stator winding 14 is wound along the third locking pin 313 and wound around the fourth magnetic pole 154 from the near side to the far side, the far side from the far side is the near side. It is pulled out to the side and passes through the wall behind the third magnetic pole 153 along the second locking pin 312 and the first locking pin 311. Fourth, after the stator winding 14 is wound around the connecting wire along the first locking pin 311 and is wound from the near side to the far side by the second magnetic pole 152, the far side from the far side is the near side. After being drawn toward the side, the lead wire 14a is positioned on the land 27 through the guide groove 30 (E2).

  As described above, in both the first phase and the second phase, the lead wire 14a of the stator winding 14 on the winding end side can be guided to the guide groove 30 without difficulty because it is configured to be guided to the guide groove 30 from the lower side.

(Modification 1)
In the embodiment described above, the locking pin 31 is shown in a round pin shape in FIG. 7, but as shown in FIG. 10, the cross-sectional shape of the locking pin 31 is formed into a pentagon of a home base shape It may be arranged to face outward, and each corner may be configured as an R surface. With such a shape, the strength can be improved as compared to the round pin shape, so that deformation of the locking pin 31 is also caused by the tension when the connecting wire of the stator winding 14 is hooked on the locking pin 31. Can be prevented.

(Modification 2)
In the embodiment described above, the wiring pattern 22 of four patterns is formed on the PCB substrate 21 in FIG. 7, and the configuration of the bipolar drive is shown, but it is not limited to this. As a result of improving the winding direction of the stator winding 14, the first virtual locking pin 311v and the second virtual locking of the crossover wire to be disposed on both sides of the first magnetic pole 151 near the through hole 26 (terminal pin) The two locking pins of the pin 312v can be eliminated, and as a result, the freedom of the nozzle operation when pulling out the end of the stator winding 14 can be increased, and the wiring pattern 22 of the PCB substrate 21 can be as shown in FIG. It can also be designed as a unipolar drive.

(Effect of the embodiment)
As described above, according to the embodiment of the present invention, the following effects can be achieved.

  Since the lead wire 14a is drawn from the lower side and drawn out to the guide groove 30, the lead wire 14a can be guided to the guide groove 30 without difficulty. As a result, the lead wire 14a does not break. Further, since the center of the connector pin 24 and the land portion 27 is shifted between the wiring pattern 22 to be the output terminal, the connector pin can be positioned and joined to the lead wire 14a of the stator winding 14 on the land portion 27 as well. You can work without being affected by the 24 positions.

  Furthermore, since the connector pins 24 and the lands 27 are formed apart from each other at both ends of the wiring pattern 22 to be output terminals, the solder of the connector pins 24 can be prevented from melting when connecting the lead wires 14a to the lands 27. . In addition, since the external connection is not formed by the lead wire as in Patent Document 1, there is no possibility that the connection is loosened to cause a conduction failure. Further, since the land portion 27 is formed on the outer edge side of the wiring pattern 22, the degree of freedom in working with the automatic soldering machine is high. In addition, since the surface (uppermost surface) A of the wiring pattern 22 is located below the lowermost surface B where the crossover (and lead-out) wire in the lower insulator 19 lies, the lead-out wire 14a of the stator winding 14 is When the substrate 21 is pulled out, workability is facilitated without restriction on the movement of the nozzle of the winding machine.

  Furthermore, as a result of improving the winding direction of the stator winding 14, the first virtual locking pin 311v and the second virtual of the crossover wire to be disposed on both sides of the first magnetic pole 151 near the through hole 26 (terminal pin). Since the two locking pins of the locking pin 312v can be eliminated, the degree of freedom of the nozzle operation at the time of pulling out the end of the stator winding 14 is increased, and the workability is improved. In addition, two locking pins of the first virtual locking pin 311v and the second virtual locking pin 312v of the crossover which should be arranged on both sides of the first magnetic pole 151 in the vicinity of the through hole 26 (terminal pin) can be eliminated. As a result, the degree of freedom of the nozzle operation when drawing out the end of the stator winding 14 can be increased, and the wiring pattern 22 of the PCB substrate 21 can also be designed as a unipolar drive.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to embodiment, A various change is possible in the range which does not deviate from the summary.

DESCRIPTION OF SYMBOLS 1 Hybrid type stepping motor 2 Stator 3 Rotor 4 Front flange 5 Rear flange 6, 7 Bearing 8, 9 Rotor core 10 Rotor magnet 11 Shaft 12 Stator core 13 Insulator 14 Stator winding 14a ... Lead-out wire 15 ... Magnetic pole 151 to 158 ... 1st magnetic pole to 8th magnetic pole 16 ... Polar tooth 17 ... Small tooth 18 ... Upper insulator 19 ... Lower insulator 20 ... Connector housing 21 ... PCB board 22 ... Wiring pattern 23 ... Inner connector 24 ... connector pin 25 ... through hole 26 ... through hole (terminal pin)
27 Land part 30 Guide groove 31 Locking pins 311 to 316 First locking pin to sixth locking pin 311v, 312v First virtual locking pin, second virtual locking pin A Wiring pattern Top surface B: Bottom surface where crossovers and leads meet

Claims (3)

A hybrid stepping motor,
Stator core,
An insulator having an upper insulator and a lower insulator mounted from both axial sides of the stator core,
A connector housing provided on the lower insulator so as to protrude radially outward and having a terminal pin and a wiring pattern;
A plurality of magnetic poles including a first magnetic pole provided on the side of the lower insulator and located near the terminal pin;
A plurality of locking pins for locking a stator winding wound around the plurality of magnetic poles;
The hybrid stepping motor according to claim 1, wherein the first magnetic pole has non-placement areas of the plurality of locking pins on both sides thereof.   When the stator core is inverted and viewed, the wiring pattern is positioned below the lowermost surface on which the crossover wire and the lead-out wire in the lower insulator are covered on the surface which is the uppermost surface thereof. Hybrid type stepping motor described in. The locking pin has a cross-sectional shape formed into a pentagon of a home base shape, and the apexes of the salient angles are disposed facing outward, and each corner portion is an R surface. The hybrid stepping motor according to 1 or 2.

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